Powershell and Client Object Model - no error thrown if user is added more than once to same site or group

Hello All -
I am trying to add a user to a SharePoint site using PowerShell like below:-
New-SPUser -UserAlias MyDomain\jan20a -Web http://SPServer/sites/MySite
If I execute the above more than once, SharePoint does not throw that user already exists or something. This is not the same behavior in AD/Exchange PowerShell cmdlets.
Also, even the client object model behaves the same way.
Another interesting thing I noticed, I tried to remove a user from group in which the user was not part of it at all and still no error..!!
Looks like SharePoint does not care of invalid input and just ignores it.
Can anyone please confirm this and also the reason behind it ?

It's not really invalid input, since the user exists and that is how SharePoint behaves (will behave same way in browser). Try to input a user that and misspell the name, e.g. say you didn't have a MyDomain\Jan21a, then try to use same script above,
only with invalid data. It will bark at you. Or try using a web that it cannot find, one that does not exist. You'll get what I like to call, the red badge of courage if you enter invalid data.
you can test that sharepoint will let you enter a user twice in the browser, and nothing bad comes from it. Powershell is just unable to tell that the user was not in the site, when you removed it the second time.
Hope that confirms it, if it does please mark this reply accordingly. thanks
Stacy Simpkins | MCSE SharePoint | www.sharepointpapa.com

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>> AF: I've commented in sections...
Without Maintain Heading Levels, RH will apply heading levels
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Hi,
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http://chakkaradeep.com/index.php/event-receivers-in-sharepoint-2010/
http://sharesaint.com/?p=77
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